Large welding cable drum handling device

Abstract

The present invention relates to a large welding cable drum handling device, belonging to the field of cable handling technology. It comprises a folding frame, which can form an M-shaped frame after being folded, and a moving wheel is installed at the lower end of the M-shaped frame; the folding frame comprises four sequentially hinged connecting frames, and the connecting frames are divided into an outer connecting frame and an intermediate connecting frame, and a ratchet locking mechanism is installed at the hinge of the outer connecting frame and the intermediate connecting frame; a plurality of groups of rotating rollers are respectively installed on the intermediate connecting frame; a supporting telescopic frame is correspondingly hingedly installed at the lower end of the intermediate connecting frame; a pull wire locking mechanism is hingedly installed on one of the intermediate connecting frames. The present invention provides a large welding cable drum handling device, which is suitable for short-distance movement of welding cables during welding, and can also be used for storing welding cables in warehouses.

Description

Technical Field

[0001] The invention relates to a large welding cable drum conveying device, belonging to the technical field of cable conveying. Background Art

[0002] With the acceleration of urbanization, power grid transformation has become one of the core tasks of urban infrastructure construction, aiming to improve the power supply capacity of the power grid, enhance operational safety, and better adapt to the rapid development of urban power demand. Traditionally, my country's power supply system mainly relies on overhead lines for power transmission, but in the modern urban environment, this method has gradually revealed many disadvantages, such as affecting the beauty of the city, being susceptible to severe weather and natural disasters that lead to power outages, etc.

[0003] Therefore, in order to optimize the urban power grid structure and improve power supply reliability, urban power grids are gradually being transformed into underground ones, that is, cable laying technology is adopted. Cable laying technology can not only effectively avoid the problems caused by overhead lines, but also improve the overall operation efficiency of the power grid. However, in the process of cable laying, especially when it comes to large-scale welding projects, the handling of cables has become an important and complex link.

[0004] As disclosed in the Chinese invention patent with publication number CN113895842A, a cable handling device includes a support frame, a clamping arm assembly and a clamping assembly. The clamping arm assembly is arranged on the support frame, and the clamping assembly is connected to the clamping arm assembly. The clamping arm assembly can drive the clamping assembly to approach or move away from the support frame. The clamping assembly includes a first clamping part and a second clamping part. The first clamping part and the second clamping part can approach each other to clamp the cable or move away from each other to release the cable.

[0005] For example, the Chinese invention patent with publication number CN112320242A includes a vehicle body, which is characterized in that: the vehicle body includes a first end crossbeam and a second end crossbeam arranged along its moving direction, and a frame connecting the first end crossbeam and the second end crossbeam, and a movable guide mechanism is fixed on the first end crossbeam and the second end crossbeam, and the movable guide mechanism includes a pin, and the pin extends toward the ground beyond the bottom edge of the first end crossbeam and the second end crossbeam.

[0006] In the process of implementing the technical solution of this application, the inventor discovered that there are at least the following technical problems in the prior art:

[0007] The existing transportation in the existing construction process cannot be well adapted and has low transportation efficiency and inflexible operation, so a high-efficiency transportation trolley is provided to meet the use requirements. Summary of the invention

[0008] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a large welding cable reel handling device which is suitable for short-distance movement of welding cables during welding and can also be used for storing welding cables in warehouses.

[0009] The large welding cable drum handling device of the present invention comprises a folding frame, which can form an M-shaped frame after being folded, and a moving wheel is installed at the lower end of the M-shaped frame;

[0010] The folding frame includes four connecting frames which are hinged in sequence. The connecting frames are divided into an outer connecting frame and a middle connecting frame. A ratchet locking mechanism is installed at the hinge between the outer connecting frame and the middle connecting frame.

[0011] Several groups of rotating rollers are respectively installed on the middle connecting frame;

[0012] A supporting telescopic frame is hingedly installed at the lower end of the middle connecting frame;

[0013] A draw wire locking mechanism is hingedly mounted on one of the middle connecting frames.

[0014] Furthermore, the moving wheels are respectively mounted on the outer ends of the two outer connecting frames and the hinges of the two middle connecting frames.

[0015] Furthermore, the moving wheel includes a mounting seat and a rotating wheel, which is rotatably mounted on the mounting seat. There are multiple groups of rotating wheels evenly distributed on the mounting seat, and the central axis of the rotating wheel is arranged perpendicular to the central axis of the mounting seat.

[0016] Furthermore, guide mechanisms arranged in mirror symmetry are installed on both sides of the rotating roller, and the guide mechanisms include guide cones, and guide strips are installed at the rear end of the guide cones;

[0017] The guide cone is slidably mounted on the outer ring of the rotating roller, and an extension sleeve is installed at one end of the guide cone located on the plane, and a locking mechanism is installed on the extension sleeve;

[0018] A guide slot is provided on the rotating roller corresponding to the guide strip, the guide strip runs through the guide slot, and both ends of the guide strip are mounted on a plane at one end of the guide cone.

[0019] Two symmetrically arranged guide mechanisms, wherein the conical surfaces of the guide cones are arranged opposite to each other.

[0020] Furthermore, the middle connecting frame is divided into a wide middle connecting frame and a narrow middle connecting frame, and the outer connecting frame is divided into a wide outer connecting frame and a narrow outer connecting frame, in which the wide outer connecting frame is hinged to the narrow middle connecting frame, the narrow middle connecting frame is hinged to the wide middle connecting frame, and the wide middle connecting frame is hinged to the narrow outer connecting frame, wherein the pull wire locking mechanism is hingedly installed on the hinge shafts of the wide middle connecting frame and the narrow outer connecting frame.

[0021] Furthermore, the connecting frame is made of square steel pipe.

[0022] Further, the wire locking mechanism comprises a locking frame, and a support portion is mounted on one end of the locking frame;

[0023] The other end of the locking frame is hingedly mounted on the hinge shafts of the wide middle connecting frame and the narrow outer connecting frame.

[0024] Furthermore, the locking frame is made of a rectangular steel pipe, and the supporting part is a support plate fixed to one end of the locking frame. When the locking frame rotates, the support plate can be abutted against one surface of the narrow outer connecting frame. The narrow outer connecting frame is correspondingly installed with a locking bolt, and the support plate can be fixed to the narrow outer connecting frame by the nut of the locking bolt.

[0025] Furthermore, the supporting telescopic frame includes a square tube hinged to the lower end of the middle connecting frame, a support column is slidably installed inside the square tube, a horizontal adjustment foot is installed at the end of the support column, and an attraction magnet I is fixed on the upper side of the square tube. When the square tube rotates, the attraction magnet I can adsorb the square tube to the middle connecting frame.

[0026] Furthermore, a fixed pin is inserted between the square tube and the support column, a connecting tube is installed on the inner side of the square tube, and an attraction magnet II is installed on the connecting tube. When the fixed pin passes through the square tube and the support column, one end of the fixed pin abuts against the attraction magnet II.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] The present invention forms an M-shaped frame after folding, and supports the cable reel through a clamping β formed by two middle connecting rods. In conjunction with the moving wheels installed at the lower end, the present invention is suitable for short-distance movement of the welding cable during welding. The force on the moving wheels on both sides is reduced by supporting the telescopic frame. When the lower end of the supporting telescopic frame abuts against the ground, the present device is further locked, so that it can be used for storing cable reels in warehouses; when the lower end of the supporting telescopic frame abuts against the ground, the pulling wire locking mechanism is lowered, so that there is a pulling support for the pulling end, which is used to support the cable reel when pulling the cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 Schematic diagram of the cable drum transport structure of embodiment 1 of the present invention;

[0030] Figure 2 is a front view of Embodiment 1 of the present invention;

[0031] Figure 3 yes Figure 2 A partial enlarged view of the middle part;

[0032] Figure 4 is a top view of embodiment 1 of the present invention;

[0033] Figure 5 yes Figure 4 A partial enlarged view of point B in the middle;

[0034] Figure 6 is a schematic structural diagram of Embodiment 1 of the present invention;

[0035] Figure 7 yes Figure 6 A partial enlarged view of point C in the middle;

[0036] Figure 8 It is a schematic diagram of a cable reel storage or wire-laying structure according to Embodiment 1 of the present invention;

[0037] Fig. 9 This is a front view of a cable drum for storing or laying out a cable according to Embodiment 1 of the present invention;

[0038] Fig.10 is a schematic diagram of a cable reel storage structure according to Embodiment 1 of the present invention;

[0039] Fig.11 yes Fig.10 A partial enlarged view of point D in the middle;

[0040] Fig.12 This is one of the schematic diagrams of the internal structure of the ratchet locking mechanism of Example 1 of the present invention;

[0041] Fig.13 It is a front view of the internal structure of the ratchet locking mechanism of Example 1 of the present invention;

[0042] Fig.14 This is the second schematic diagram of the internal structure of the ratchet locking mechanism of Example 1 of the present invention;

[0043] Fig.15 is a schematic structural diagram of a ratchet locking mechanism according to Embodiment 1 of the present invention;

[0044] Fig.16 is a schematic diagram of a wire-receiving structure of Embodiment 1 of the present invention;

[0045] Fig.17 is a schematic diagram of the support mechanism structure of Example 1 of the present invention;

[0046] In the figure:

[0047] 1. Moving wheel; 11. Mounting seat; 12. Rotating wheel;

[0048] 2. Outer connecting frame; 21. Wide outer connecting frame; 22. Narrow outer connecting frame;

[0049] 3. Support telescopic frame; 31. Square tube; 32. Support column; 33. Attracting magnet I; 34. Horizontal adjustment foot; 35. Connecting tube; 36. Attracting magnet II; 37. Fixed pin shaft;

[0050] 4. Middle connecting frame; 41. Wide middle connecting frame; 42. Narrow middle connecting frame;

[0051] 5. Rotating roller; 51. Guide chute;

[0052] 6. Cable locking mechanism; 61. Locking frame; 62. Support plate; 63. Locking bolt;

[0053] 7. Guide mechanism; 71. Guide cone; 711. Plane; 712. Cone; 72. Guide strip; 73. Extension sleeve; 74. Locking mechanism;

[0054] 8. Cable reel;

[0055] 9. ratchet locking mechanism; 91. housing; 911. connecting column II; 912. mounting block; 92. cover plate; 921. arc groove; 93. ratchet; 94. elastic member; 941. hinge seat; 942. compression spring; 95. pawl; 951. connecting column I; 952. retracting part; 953. locking pawl; 96. rotating shaft II; 97. transmission shaft; 98. rotating shaft I; 99. bushing;

[0056] 100, driving device; 200, supporting mechanism; 201, supporting column; 202, supporting sleeve; 203, sliding rod. DETAILED DESCRIPTION

[0057] Example 1

[0058] like Figure 1 to Figure 17 As shown, the large welding cable drum handling device of the present invention comprises a folding frame, which can form an M-shaped frame after being folded, and a moving wheel 1 is installed at the lower end of the M-shaped frame;

[0059] The folding frame includes four hinged connecting frames, the connecting frames are divided into an outer connecting frame 2 and a middle connecting frame 4, and a ratchet locking mechanism 9 is installed at the hinge between the outer connecting frame 2 and the middle connecting frame 4;

[0060] like Figure 11 to Figure 15As shown, the ratchet locking mechanism 9 includes a shell 91, on which a cover plate 92 is correspondingly mounted, a ratchet 93 is mounted inside the shell 91, the ratchet 93 is rotatably connected to a rotating shaft Ⅰ 98, a matching pawl 95 is mounted at one end of the ratchet 93, the pawl 95 is rotatably connected to a rotating shaft Ⅱ 96, an elastic member 94 is connected between the pawl 95 and the shell 91, the elastic member 94 makes the locking portion of the pawl 95 abut against the ratchet 93; a transmission shaft 97 is mounted on the ratchet 93, the cross-section of the transmission shaft 97 is square or rectangular, and a shaft sleeve 99 is mounted on the transmission shaft 97; the shaft sleeve 99 is used for articulating the pull-wire locking mechanism 6, so that the pull-wire locking mechanism 6 can rotate on the shaft sleeve 99; a mounting block 912 is provided on the outer side of the shell, and the mounting block 912 is used for mounting on the connecting frame.

[0061] An arc-shaped notch is formed at the upper end of the pawl 95, a connecting column I 951 is installed in the arc-shaped notch, a connecting column II 911 is installed at a corresponding position inside the housing 91, the elastic member 94 includes hinge seats 941 arranged on both sides, a compression spring 942 is fixed between the two hinge seats 941, and the two hinge seats 941 are hingedly installed on the connecting column I 951 and the connecting column II 911 respectively;

[0062] The pawl 95 is also provided with a retracting portion 952. By moving the retracting portion 952 in one direction, the pawl 95 is rotated along the rotating shaft II 96, so that the ratchet wheel 93 can be rotated in the opposite direction.

[0063] The retracting portion 952 is a lever fixed to the surface of the pawl 95 , and an arc groove 921 is formed on the cover plate 92 corresponding to the lever.

[0064] The pawl 95 is arranged eccentrically as a whole, and at least two locking claws 953 are provided on the pawl 95; Fig.13 As shown, when the ratchet 93 rotates counterclockwise, the pawl 95 rotates clockwise. When the ratchet 93 rotates clockwise, since the locking pawl 953 is not on the outer circumference of the pawl 95, the locking pawl 953 is in an eccentric position, as shown by the arrow in the figure. At this time, the ratchet 93 is locked and cannot rotate. Through the arrangement of the pawl 95, the locking of the ratchet 93 and the pawl 95 can withstand a larger locking force, thereby avoiding the pawl 95 from being damaged due to excessive weight.

[0065] Several groups of rotating rollers 5 are respectively installed on the middle connecting frame 4;

[0066] A supporting telescopic frame 3 is hingedly mounted on the lower end of the middle connecting frame 4;

[0067] A pull-wire locking mechanism 6 is hingedly mounted on one of the middle connecting frames 4 .

[0068] The moving wheels 1 are respectively mounted on the outer ends of the two outer connecting frames 2 and the hinges of the two middle connecting frames 4 .

[0069] The moving wheel 1 includes a mounting seat 11 and a rotating wheel 12. The rotating wheel 12 is rotatably mounted on the mounting seat 11. There are multiple groups of rotating wheels 12 evenly distributed on the mounting seat 11, and the central axis of the rotating wheel 12 is arranged perpendicular to the central axis of the mounting seat 11; lateral and longitudinal movement can be achieved.

[0070] The rotating roller 5 is also provided with guide mechanisms 7 arranged in mirror symmetry on both sides, the guide mechanism 7 comprises a guide cone 71, and a guide strip 72 is provided at the rear end of the guide cone 71;

[0071] The guide cone 71 is slidably mounted on the outer ring of the rotating roller 5. An extension sleeve 73 is installed at one end of the guide cone 71 located on the plane 711. A locking mechanism 74 is installed on the extension sleeve 73. The locking mechanism 74 is a locking screw.

[0072] A guide slot 51 is provided on the rotating roller 5 corresponding to the guide strip 72. The guide strip 72 runs through the guide slot 51, and both ends of the guide strip 72 are mounted on a plane 711 at one end of the guide cone 71.

[0073] Two symmetrically arranged guide mechanisms 7 , wherein the conical surfaces 712 of the guide cones 71 are arranged opposite to each other; the guide mechanisms 7 prevent the cable drum 8 from moving axially on the rotating roller 5 .

[0074] The middle connecting frame 4 is divided into a wide middle connecting frame 41 and a narrow middle connecting frame 42, and the outer connecting frame 2 is divided into a wide outer connecting frame 21 and a narrow outer connecting frame 22, in which the wide outer connecting frame 21 is hinged to the narrow middle connecting frame 42, the narrow middle connecting frame 42 is hinged to the wide middle connecting frame 41, and the wide middle connecting frame 41 is hinged to the narrow outer connecting frame 22, wherein the pull wire locking mechanism 6 is hingedly installed on the hinge shafts of the wide middle connecting frame 41 and the narrow outer connecting frame 22.

[0075] like Figure 1 or Figure 2 As shown, the ratchet locking mechanism 9 is respectively installed on the narrow outer connecting frame 22 and the narrow middle connecting frame 42 through the mounting block 912 at the rear end of the shell 91, so that the clamping β formed between the narrow middle connecting frame 42 and the wide middle connecting frame 41 is in a locked position, and the clamping β formed between the narrow middle connecting frame 42 and the wide middle connecting frame 41 can be adjusted by the wide outer connecting frame 21 and the narrow outer connecting frame 22 on both sides to cooperate with the ratchet locking mechanism 9, so as to adapt to cable reels 8 of different diameters.

[0076] The connecting frame is made of square steel pipe, which is easy to obtain materials and construct.

[0077] The wire locking mechanism 6 comprises a locking frame 61, and a support portion is installed at one end of the locking frame 61;

[0078] The other end of the locking frame 61 is hingedly mounted on the hinge shafts of the wide middle connecting frame 41 and the narrow outer connecting frame 22 .

[0079] The locking frame 61 is made of a rectangular steel pipe, and the supporting part is a support plate 62 fixed to one end of the locking frame 61. When the locking frame 61 rotates, the support plate 62 can be abutted against one surface of the narrow outer connecting frame 22. A locking bolt 63 is correspondingly installed on the narrow outer connecting frame 22, and the support plate 62 can be fixed to the narrow outer connecting frame 22 by the nut of the locking bolt 63.

[0080] The supporting telescopic frame 3 includes a square tube 31 hinged to the lower end of the middle connecting frame 4, a supporting column 32 is slidably installed inside the square tube 31, a horizontal adjustment foot 34 is installed at the end of the supporting column 32, and an attraction magnet I33 is fixed on the upper side of the square tube 31. When the square tube 31 rotates, the attraction magnet I33 can adsorb the square tube 31 to the middle connecting frame 4.

[0081] A fixing pin 37 is inserted between the square tube 31 and the support column 32, a connecting tube 35 is installed on the inner side of the square tube 31, and an attraction magnet II 36 is installed on the connecting tube 35. When the fixing pin 37 is inserted through the square tube 31 and the support column 32, one end of the fixing pin 37 abuts against the attraction magnet II 36.

[0082] The attraction magnet I 33 and the attraction magnet II 36 are permanent magnets, and neodymium magnets can be selected.

[0083] like Figure 16-17 The invention also includes a driving device 100 installed on the middle connecting frame 4, a servo motor is arranged inside the driving device 100, the driving device 100 is used to drive the rotating roller 5 to rotate, a supporting mechanism 200 is slidingly sleeved on the rotating roller 5, the supporting mechanism 200 includes a supporting column 201, an adjustable supporting sleeve 202 is installed under the supporting column 201, a sliding rod 203 is slidingly connected to the lower end of the supporting sleeve 202, a tension spring is installed between the sliding rod 203 and the supporting sleeve 202, which is used to press the cable drum 8 onto the rotating roller 5, so as to perform the wire-winding operation.

[0084] The slide bar 203 is slidably mounted on the rotating roller 5 , and the support column 201 is mounted on the central axis of the cable drum 8 , thereby realizing the rotation of the cable drum 8 .

[0085] Working process or working principle:

[0086] like Figure 1 or Figure 2 As shown, during transportation, the wide outer connecting frame 21 and the narrow outer connecting frame 22 are first adjusted in cooperation with the ratchet locking mechanism 9. After the adjustment is completed, the cable drum 8 is placed on the rotating roller 5 between the wide middle connecting frame 41 and the narrow middle connecting frame 42, and the device can be pushed to move.

[0087] like Figure 8 or Fig. 9 As shown, when storing, the supporting telescopic frame 3 is turned downward, and the supporting column 32 is adjusted to a suitable position, so that the horizontal adjustment footrest is lowered to reduce the load-bearing of the moving wheel, or the moving wheel is slightly off the ground, so as to support the cable drum 8.

[0088] like Figure 8 or Fig. 9 As shown, when releasing the wire, the wire locking mechanism is lowered so that the support plate 62 is against the ground, as shown in FIG. Fig. 9 As shown by the middle arrow F, the cable is pulled along the direction of the arrow F. At this time, the locking frame 61 and the supporting telescopic frame 3 form a triangular structure, thereby improving the stability during pulling.

[0089] The description of the direction and relative position relationship of the structure in the present invention, such as the description of front, back, left, right, up, and down, does not constitute a limitation of the present invention, but is only for the convenience of description.

Claims

1. A large welding cable drum handling device, characterized in that: It comprises a folding frame, which can form an M-shaped frame after being folded, and a moving wheel (1) is installed at the bottom end of the M-shaped frame; The folding frame comprises four connecting frames which are hinged in sequence, wherein the connecting frames are divided into an outer connecting frame (2) and a middle connecting frame (4), and a ratchet locking mechanism (9) is installed at the hinge between the outer connecting frame (2) and the middle connecting frame (4); A plurality of groups of rotating rollers (5) are respectively mounted on the middle connecting frame (4); A supporting telescopic frame (3) is hingedly mounted correspondingly to the lower end of the middle connecting frame (4); A pull-wire locking mechanism (6) is hingedly mounted on one of the middle connecting frames (4); Guide mechanisms (7) arranged in mirror-symmetrical manner are also mounted on both sides of the rotating roller (5), the guide mechanism (7) comprising a guide cone disk (71), and a guide strip (72) is mounted at the rear end of the guide cone disk (71); The guide cone disk (71) is slidably mounted on the outer ring of the rotating roller (5); an extension sleeve (73) is mounted on one end of the guide cone disk (71) located on the plane (711); and a locking mechanism (74) is mounted on the extension sleeve (73); A guide slot (51) is provided on the rotating roller (5) corresponding to the guide strip (72), the guide strip (72) penetrates the guide slot (51), and both ends of the guide strip (72) are mounted on a plane (711) at one end of the guide cone (71); Two symmetrically arranged guide mechanisms (7), wherein the conical surfaces (712) of the guide cone disks (71) are arranged opposite to each other; The middle connecting frame (4) is divided into a wide middle connecting frame (41) and a narrow middle connecting frame (42), and the outer connecting frame (2) is divided into a wide outer connecting frame (21) and a narrow outer connecting frame (22), wherein the wide outer connecting frame (21) is hingedly connected to the narrow middle connecting frame (42), the narrow middle connecting frame (42) is hingedly connected to the wide middle connecting frame (41), and the wide middle connecting frame (41) is hingedly connected to the narrow outer connecting frame (22), wherein the wire locking mechanism (6) is hingedly installed on the hinge shafts of the wide middle connecting frame (41) and the narrow outer connecting frame (22); The wire locking mechanism (6) comprises a locking frame (61), and a support portion is mounted on one end of the locking frame (61); The other end of the locking frame (61) is hingedly mounted on the hinge shafts of the wide middle connecting frame (41) and the narrow outer connecting frame (22); The clamping β formed between the narrow middle connecting frame (42) and the wide middle connecting frame (41) can be adjusted by cooperating with the ratchet locking mechanism (9) through the wide outer connecting frames (21) and the narrow outer connecting frames (22) on both sides, and the cable drum is supported by the clamping β formed by the two middle connecting frames (4).

2. The large welding cable drum handling device according to claim 1, characterized in that: The moving wheels (1) are respectively mounted on the outer ends of the two outer connecting frames (2) and the hinges of the two middle connecting frames (4).

3. The large welding cable drum handling device according to claim 2, characterized in that: The moving wheel (1) comprises a mounting seat (11) and a rotating wheel (12), wherein the rotating wheel (12) is rotatably mounted on the mounting seat (11), a plurality of rotating wheels (12) are evenly distributed on the mounting seat (11), and a central axis of the rotating wheel (12) is arranged perpendicular to a central axis of the mounting seat (11).

4. The large welding cable drum handling device according to claim 1, characterized in that: The connecting frame is made of square steel pipe.

5. The large welding cable drum handling device according to claim 1, characterized in that: The locking frame (61) is made of a rectangular steel tube, and the supporting portion is a supporting plate (62) fixed to one end of the locking frame (61). When the locking frame (61) rotates, the supporting plate (62) can abut against one surface of the narrow outer connecting frame (22). A locking bolt (63) is correspondingly installed on the narrow outer connecting frame (22), and the supporting plate (62) can be fixed to the narrow outer connecting frame (22) by a nut of the locking bolt (63).

6. The large welding cable drum handling device according to claim 1, characterized in that: The supporting telescopic frame (3) comprises a square tube (31) hinged to the lower end of the intermediate connecting frame (4), a supporting column (32) is slidably mounted inside the square tube (31), a horizontal adjustment foot (34) is mounted at the end of the supporting column (32), and an attracting magnet I (33) is fixed to the upper side of the square tube (31). When the square tube (31) rotates, the attracting magnet I (33) can adsorb the square tube (31) onto the intermediate connecting frame (4).

7. The large welding cable drum handling device according to claim 6, characterized in that: A fixing pin (37) is inserted between the square tube (31) and the support column (32), a connecting tube (35) is installed on the inner side of the square tube (31), and an attracting magnet II (36) is installed on the connecting tube (35). When the fixing pin (37) is inserted through the square tube (31) and the support column (32), one end of the fixing pin (37) abuts against the attracting magnet II (36).

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